Yeah, I remember now... Some of the saws in that series had a middle plate that fits in between the inner and outer covers. I don't think there was any additional baffling. An old 038 that I had was made that way. I seem to recall that the inner plate wasn't held by anything besides being...
The hole is likely for a screen. There should be a box like baffle affair with holes in it attached to inner muffler half that the exhaust blows through. If you clean the carbon off you can probably see where it was once attached. No longer having that part will make for a loud muffler.
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